Re: camera evaluation brought up image processing/color space questions
Re: camera evaluation brought up image processing/color space questions
- Subject: Re: camera evaluation brought up image processing/color space questions
- From: David Remington <email@hidden>
- Date: Fri, 10 Nov 2000 15:36:59 -0500
David,
Thanks for the quick reply and for again sharing your knowledge. You have
confirmed my fears.
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If you have broad gamut info moved to a smaller space by perceptual
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compression it is possible to regain the more saturated colors by applying a
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wider gamut profile to the image which will stretch them out again; this is
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not the same as converting to the wider profile, which would simply place the
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colors into the larger space at their current reduced gamut. However if the
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file was clipped to the smaller gamut (colorimetric conversion, as opposed to
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perceptual) then it will have lost the distinctions between in- and out- of
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gamut colors, and no reversal is possible. This all assumes high bit files to
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avoid banding and other such artifacting...
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But simply opening the file in AdobeRGB is the equivalent of this, and you
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find that this offers an oversaturated result, so there doesn't appear to be
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a simple fix to your problem, and you will need to hope that it is possible
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to profile the device without such gamut limits.
This will have to be looked into with the manufacturer before this camera
can be seriously considered. As opening the file in Adobe RGB 1998 without
conversion results in a oversaturated image, and converting into the wider
space would simply place the reduced gamut colors correctly, an alternate
solution would have to be found.
David Remington